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Re: useing the comp's phone jack

There's Skype. I believe comp-comp communications are free. Also you can try Windows Messenger. It has a feature that'll allow you to communicate via the internet for free. Both programs require internet connection, the software, and some sort of microphone/webcam, and speakers (webcam's only needed if you want to have video connection too).

Re: useing the comp's phone jack

There's such programs called "software modems". I don't know how they work, but I doubt you'd be able to do it in pure Java. You can "place" a phone call by sending different signals to the phone jack (technically, if you're good enough you can "place" a phone call by making noises into the recording mouth piece, I don't know if they changed that now, but it should still work because the design of phone jacks haven't really changed). This is completely dependent on your computer having a valid phone jack (NOT Ethernet jack), as well as you finding the correct signals to send (shouldn't be too hard, just need to record some beeps and boops from a real phone).

Re: useing the comp's phone jack

the signals are easy , if i'm right all i'd need is the sound api and to know the frequency of the tones ( witch can be looked up ).
the problem is how to send those signals to the phone jack ( yes my comp has a normal phone jack , w/o it i wouldn't be online right now ) know of any obscure api's that may have what i'm looking for ?

Re: useing the comp's phone jack

I used to work with sending FAX and voice messages from a server environment but we used proper hardware in our servers which could open up over 500 simultaneous connections. These cards were about £3000 each though.